[1] is the plant species Hypericum perforatum, also known as Tipton's Weed or Klamath weed, but, with qualifiers, is used to refer to any species of the genus Hypericum. Therefore, H. perforatum is sometimes called Common St John's wort to differentiate it. The species of Hypericum have been placed by some in the family Hypericaceae, but more recently have been included in the Clusiaceae.

[2] Approximately 370 species of the genus Hypericum exist worldwide with a native geographical distribution including temperate and subtropical regions of North America, Europe, Asia Minor, Russia, India, and China. St. John's wort is widely known as a herbal treatment for depression.

St. John S Wort Extract Powder - By Tracy1177 - On Mon 07 Jan, 2008 7:16 am: wort extract is a secure nerval nutrilite it has always been used for mild to moderate depression scientific studies of the herb suggest that it act....

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